Harrison Lake FAS campground is a large spacious campground with most campsite being well spread out from each other.  The fishing access site has several vault toilets, which is nice for how large of an area the campground occupies.  Each campsite has a picnic table and a metal fire ring.  Plenty of flat ground at each site for your tent. No water or trash service is available.   The site has a concrete boat ramp as well as several other locations one could put a boat in the water.  The lake is really hurting for water this year, I would say that about only 25% of the lake volume was left on my visit, so this lake and all of Montana could really do with some rain.   The big down point for this campground is that everything is in the open, the site has no trees so you are at the mercy of the sun and wind.